<template>
  <div>
    <h4 :style="{ marginBottom: '20px' }">{{ title }}</h4>
    <v-chart :force-fit="true" :height="height" :data="data" :scale="scale" :onClick="handleClick">
      <v-tooltip />
      <v-axis />
      <v-legend />
      <v-line position="type*y" color="x" />
      <v-point position="type*y" color="x" :size="4" :v-style="style" :shape="'circle'" />
    </v-chart>
  </div>
</template>

<script>
import { DataSet } from '@antv/data-set'
import { ChartEventMixins } from './mixins/ChartMixins'

export default {
  name: 'LineChartMultid',
  mixins: [ChartEventMixins],
  props: {
    title: {
      type: String,
      default: ''
    },
    dataSource: {
      type: Array,
      default: () => [
        { type: '1~10', 闽A123401: 7.0, 闽A123402: 3.9, 闽A123403: 2.0, 闽A123404: 7.1, 闽A123405: 7.2 },
        { type: '11~20', 闽A123401: 6.9, 闽A123402: 4.2, 闽A123403: 3.1, 闽A123404: 5.2, 闽A123405: 7.2 },
        { type: '21~30', 闽A123401: 9.5, 闽A123402: 5.7, 闽A123403: 4.2, 闽A123404: 6.2, 闽A123405: 7.2 }
        // { type: 'Apr', jeecg: 14.5, jeebt: 8.5 },
        // { type: 'May', jeecg: 18.4, jeebt: 11.9 },
        // { type: 'Jun', jeecg: 21.5, jeebt: 15.2 },
        // { type: 'Jul', jeecg: 25.2, jeebt: 17.0 },
        // { type: 'Aug', jeecg: 26.5, jeebt: 16.6 },
        // { type: 'Sep', jeecg: 23.3, jeebt: 14.2 },
        // { type: 'Oct', jeecg: 18.3, jeebt: 10.3 },
        // { type: 'Nov', jeecg: 13.9, jeebt: 6.6 },
        // { type: 'Dec', jeecg: 9.6, jeebt: 4.8 }
      ]
    },
    fields: {
      type: Array,
      default: () => ['闽A123401', '闽A123402', '闽A123403', '闽A123404', '闽A123405']
    },
    // 别名，需要的格式：[{field:'name',alias:'姓名'}, {field:'sex',alias:'性别'}]
    aliases: {
      type: Array,
      default: () => []
    },
    height: {
      type: Number,
      default: 254
    }
  },
  data() {
    return {
      scale: [
        {
          dataKey: 'x',
          min: 0,
          max: 1
        }
      ],
      style: { stroke: '#fff', lineWidth: 1 }
    }
  },
  computed: {
    data() {
      const dv = new DataSet.View().source(this.dataSource)
      dv.transform({
        type: 'fold',
        fields: this.fields,
        key: 'x',
        value: 'y'
      })
      let rows = dv.rows
      // 替换别名
      rows.forEach(row => {
        for (let item of this.aliases) {
          if (item.field === row.x) {
            row.x = item.alias
            break
          }
        }
      })
      return rows
    }
  }
}
</script>

<style scoped></style>
